BenutzerhandbuchInhaltsverzeichnisIntroduction8Scope8Audience8Contact Information, Support8Document Organization9Text Conventions10Related Documents10General Product Description11Overview11Product Specifications12RoHS Compliance13DE921 Module Connections14Pin-Out14BGA Pads Layout19Hardware Commands20Turning on the DE921 module20Initialization and Activation State20Turning off the DE921 module22Shutdown by Software Command23Hardware Shutdown23Hardware Reset24Hardware Reset24Summary of Turning ON and OFF the Module25Power Supply26Power Supply Requirements26General Design Rules28Electrical Design Guidelines28+ 5V Input Source Power Supply Design Guidelines28+12V Input Source Power Supply Design Guidelines29Battery Source Power Supply Design Guidelines30Thermal Design Guidelines31Power Supply PCB layout Guidelines32Antenna34CDMA Antenna Requirements34CDMA antenna – PCB line Guidelines35PCB Guidelines in case of FCC certification36CDMA Antenna – Installation Guidelines38GNSS Antenna Requirements39Combined GNSS Antenna39Linear and Patch GNSS Antenna39The Design Considerations to enhanced GNSS performance39GNSS Antenna – PCB Line Guidelines42GNSS Antenna – Installation Guidelines42USB Port43Serial Port44Modem Serial Port 145Modem Serial Port 246RS232 Level Translation46Audio Section Overview49Electrical Characteristics49CODEC Example4910. General Purpose I/O50Logic Level Specification51Using a GPIO Pad as Input51Using a GPIO Pad as Output52Using the Temperature Monitor Function52Short Description52Indication of Network Service Availability53VCOIN54VCC_1V8 Power Output5511. ADC section56ADC Converter56Description56Using ADC Converter5612. Test Point5713. Mounting the Module on your Board58General58Module Finishing & Dimensions58Recommended foot print for the application59PCB Pad Design59Recommendations for PCB Pad Dimensions (mm)60Solder Paste61Solder Reflow6114. Packing System63Reel63Carrier Tape Detail63Reel Detail63Packaging Detail63Moisture Sensibility6415. Application Design Guide65Download and Debug Port6516. Certifications and Conformity6617. Safety Recommendations6918. Document History70Größe: 4,56 MBSeiten: 70Language: EnglishHandbuch öffnen